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Martensitic stainless steel for fuel injection member and fuel injection member using same

a technology of stainless steel and fuel injection member, which is applied in the direction of corrosion prevention fuel injection, machines/engines, mechanical apparatus, etc., to achieve the effect of high hardness and corrosion resistance compatibility, and higher reliability

Pending Publication Date: 2019-07-11
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is for a type of stainless steel that can be used in fuel injection members of automobiles. It has high hardness and is resistant to corrosion, making it more reliable than other steels.

Problems solved by technology

In addition, due to the worldwide spread of automobiles, there are increasing cases where it is necessary to use fuels with a lot of impurities depending on the region.

Method used

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[0053]While primary melting in the atmosphere (under atmospheric pressure) was performed, at this time, adhesion of moisture to raw materials was reduced as much as possible in order to reduce mixing in of hydrogen as much as possible while carefully selecting the raw materials. After deoxidation by Si, Mn, or the like, in primary melting, oxide-based inclusions and sulfide-based inclusions were removed as much as possible in a state in which a prescribed amount of N was incorporated through electroslag remelting, and an ingot of Steel No. 1 of the present invention was obtained. Chemical components in Steel No. 1 of the present invention are shown in Table 1. The elements shown in the upper rows are essential elements that are added, and the elements shown in lower rows are impurity elements.

TABLE 1(mass %)No.CSiMnNiCrMoWBN10.440.270.300.1016.572.470.190.00230.17PSCuAlTiNbVOH0.0180.00040.020.0060.0020.010.040.00200.0003Remarks 1: The remainder is Fe and inevitable impurities.

[0054]...

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Abstract

A martensitic stainless steel for a fuel injection member contains, in mass %, at least 0.35% and less than 0.50% of C, more than 0.20% and at most 0.40% of Si, 0.2-0.4% of Mn, 0.25% or less of Ni, 15.0-17.0% of Cr, more than 2.0% and at most 3.0% of Mo, 0.1-0.3% of W, 0.001-0.003% of B, and at least 0.15% and less than 0.20% of N, with the remainder comprising Fe and inevitable impurities, which include 0-0.025% of P, 0-0.005% of S, 0-0.2% of Cu, 0-0.05% of Al, 0-0.02% of Ti, 0-0.02% of Nb, 0-0.15% of V, 0-0.003% of O, and 0-0.001% of H.

Description

TECHNICAL FIELD[0001]The present invention relates to a martensitic stainless steel for a fuel injection member such as an engine for an automobile or the like, and a fuel injection member using the same.BACKGROUND ART[0002]In an internal combustion engine such as an engine for an automobile or the like, in recent years, due to improvement in fuel consumption of automobiles, tightening of regulations on exhaust gas, or the like, use of engines in which exhaust gas recirculation (EGR) systems using a high temperature exhaust gas are installed has increased. In addition, due to the worldwide spread of automobiles, there are increasing cases where it is necessary to use fuels with a lot of impurities depending on the region. Due to recirculation of exhaust gas and use of fuels with a large amount of impurities, fuel injection members are being exposed to more severely corrosive environments than in the past, and improvement in corrosion resistance as well as having a high degree of har...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C38/00F02M61/16
CPCC22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42F02M61/166C22C38/04C22C38/02C22C38/002C22C38/001F02M2200/05C22C38/06F02M2200/9053C22C38/00
Inventor UEHARA, TOSHIHIROTOJI, AKIHIRO
Owner PROTERIAL LTD
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